There are many facebook pages where u can put ads like Garage Sale. Also Olx.com.jo, jordan.dubizzle.com and expatriates.com for your clothing but for the electronics check out @OpenSooq or @EXXAB

Where can I find used or new scooters for sale or rent?

you can probs find one on @OpenSooq

Where can I find studios for rent?

Visit @OpenSooq , a lot of people list their properties for rent there

Where can I find gaming monitors?

Your best option is to get it online @OpenSooq

Where can I sell electronics (stereos, laptops, phones..) to a store?

Try to post them on @OpenSooq it is a great website to sell used stuff

Where can I sell my DVDs?

You can sell them on @OpenSooq or dubbizle

Where can I find a place that buys used cars (I have a 2012 Peugeot 308)?

sell it on @OpenSooq or go visit @El Haraj in tabarbour

Where can I buy used Segways & Hoverboards?

Your best hope is @OpenSooq , but i'm not sure you are going to find a used one here in Jordan!

Where can I buy a cheap "less than 20jd" zippo lighter?

It's hard to find it with that price, but check @OpenSooq and dubbizle.com you might find it in a good price

Where can I sell my Nike Air Mag size 45 (200JD)?

You also have options such as @OpenSooq @EXXAB and Jordan Dubizzle and theres also Facebook garage sale amman! Best of luck

Where can I buy a GoPro Hero 3 for under 200 JD?

Try to look for it online on @OpenSooq and dubizzle.com

Where can I find people who need English-Arabic translation services?

Check @OpenSooq

Where can I sell professional cameras?

Garage sale amman on Facebook or @EXXAB @OpenSooq